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1987年12月22日至1988年1月4日,在北纬22度21分,东经102度31分,即云南玉溪市区附近连续发生了171次小震,其中 M≥2.0级地震22次,最大震级为3.6级。由于震中位于人口密集的市区,2.0级左右地震市区普遍有感,3.0级以上地震感觉强烈。玉溪市是滇南重镇,工农业日产总值约250万元;该市距1970年1月5日通海7.7级大震的极震区仅22公里左右,这次小震群发生的时间又逼近1月5日,当地群众担心会发
From December 22, 1987 to January 4, 1988, 171 small earthquakes occurred continuously at the interval of 22 degrees 21 minutes north latitude and 102 degrees 31 east longitude, that is, near the urban area of Yuxi, Yunnan, with 22 earthquakes of magnitude M≥2.0, The maximum magnitude is 3.6. Due to the fact that the epicenter was located in a densely populated urban area, there was a general feeling about the magnitude 2.0 earthquake in the urban area, and the magnitude 3.0 and above earthquakes felt strong. Yuxi City is a major town in southern Yunnan, with a total daily output of industrial and agricultural output of about 2.5 million yuan. The city is only 22 kilometers away from the very earthquakes that hit the 7.7-magnitude earthquake on January 5, 1970, and the time of this small swarm was approaching January 5, the local people are worried about hair